There aren't enough houses to go around in the UK, which
naturally pushes up prices. But the government's Help to Buy
scheme, which lets first time buyers get a mortgage with a
deposit of just 5%, has added even more demand to the market by
adding in a chunk of buyers who wouldn't normally be able to
afford it.

All of this has created the perfect conditions for house
builders, who are making big profits off whatever they build.
Galliford Try only built about 2% more homes compared to last
year, but revenue from them rose 11%.

Galliford Try acknowledges how important the government's role in
the house market right now when it talks about the assumptions in
its strategy up to 2018 (emphasis ours):

Those assumptions were no material early tightening of the
private housing market, with mortgage availability and
flexibility continuing to grow. More broadly, the plan assumed
continuation of [sic] Central Government support for the supply
of affordable housing including support for first-time
buyers and a steady recovery in the wider construction
market. We also assumed a tougher building environment in
the early years, stabilising towards the end of the period.

In fact, the only thing holding housebuilders back at the moment
is they can't build homes fast enough. Because building houses is
like printing money right now all house builders are piling in to
build new properties.

That means there's a shortage of skilled labourers, like
electricians, to fit out properties. Here's Galliford Try
(emphasis ours):

In Housebuilding, the UK's supply of new homes continues to fall
significantly short of demand, underpinning the growth
aspirations of both Linden Homes and Galliford Try Partnerships.
The outlook for Linden Homes remains strong, with the mortgage
and land markets and the planning environment all positive.
The main issue is building to schedule, given the
shortage of skilled people.

Redrow and Barratt had similar complaints. But really these are
minor quibbles given the profit and revenue rises these guys are
posting. In reality, Help to Buy has helped create a golden age
for house builders.